Jumping exposure

[Koala]

So shooting video 1080/60, shutter priority 1/120 and manual ISO my exposure changes even with the scene not changing. Looks like aperture is changing although number on display does not. If I set to auto ISO this does not happen. To be expected or? Do I have to shoot video full manual?

 

[parkgt]

So shooting video 1080/60, shutter priority 1/120 and manual ISO my exposure changes even with the scene not changing. Looks like aperture is changing although number on display does not. If I set to auto ISO this does not happen. To be expected or? Do I have to shoot video full manual?

Yes expected, shoot in manual if you don't want any changes.

 

[jmbsmt63]

Lock your exposure (AEL) in the settings. The camera uses whatever is available (not set manually by you) to automatically correct the exposure. If you lock the exposure manually that will stop that